Comparative Assessment of Modes of Reproductive Isolation among Four Species of Leopard Frogs (rana Pipiens Complex).


It is well known that sympatric congeneric species maintain their respective identities by limiting interspecific gene exchange. Mayr (1963) has outlined the principal categories of mechanisms that result in reproductive isolation. Following Mecham (1961), he classifies such mechanisms as either pre mating (methods that limit wastage of reproductive effort and are subject to selective improvement) or postmating (methods that limit the success of interspecies matings and are not subject to direct selective improvement). Mayr stressed that typically it is the interplay of many reproductive isolating mechanisms that is responsible for limiting interspecific breeding, but that one factor often is dominant. For example, in anurans it is generally believed that the mating call is typically the primary factor responsible for accomplishing mating discrimination between congeners (Blair, 1974). In recent years, considerable attention has been focused on elucidating reproductive isolating mechanisms and associated gene-flow characteristics in species complexes. The leopard frogs, Rana pipiens complex, have proven useful subjects for such studies (Mecham, 1968; Platz, 1972, 1976, 1981; Platz and Platz, 1973; Kruse and Dunlap, 1976; Frost and Bagnara, 1977a, 1977b; Sage and Selander, 1979; Hillis, 1981) because member species generally share narrow zones of geographical contact. Although progress has been made much remains to be learned about repro-

DOI: 10.1111/j.1558-5646.1983.tb05514.x

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@article{Frost1983ComparativeAO, title={Comparative Assessment of Modes of Reproductive Isolation among Four Species of Leopard Frogs (rana Pipiens Complex).}, author={John S Frost and James Ernest Platz}, journal={Evolution; international journal of organic evolution}, year={1983}, volume={37 1}, pages={66-78} }